CORRECT
Given the balanced chemical reaction given as:
[tex]4Zn+10HNO_3\rightarrow4Zn\mleft(NO_3\mright)_2+N_2O+5H_2O[/tex]From the equation, 4 moles of Zn(NO3)2, also reacted with 1 mole of N2O. Hence the mole ratio from the equation will be the ratio of 4 moles of Zn(NO3)2 to 1 mole of N2O.
Hence the derived mole ratio as described is true.
[tex]\frac{4molesZn(NO_3)_2}{1moleofN_2O}[/tex]